Interference canceller using tap-weight adaptive filter

Details Interference canceller using tap-weight adaptive filter Interference canceller using tap-weight adaptive filter

1991-11-01

1993-03-09

Callahan, Timothy P.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

328167, 381 71, 455306, 307521, H03B 100, H03K 500, H04B 110

Patent

active

051929180

ABSTRACT:
An interference canceller comprises a first input terminal (10) to which a combined signal and noise is supplied, and a second input terminal (12) to which a reference signal correlated with the noise is supplied. A subtractor (11) has a first input coupled to the first input terminal (10) and an output coupled to the output terminal of the canceller. An adaptive filter (13) has an input connected to the second input terminal (12) and an output connected to a second input of the subtractor (11). A detector (14) is provided for generating a signal representative of the magnitude of the output of the subtractor (11). A calculation circuit (17) is coupled to the detector for generating a signal that is inversely variable as a function of the output of the detector. A multiplier (18, 20) scales a stepsize with the inversely variable signal and multiplies the output of the subtractor with the scaled stepsize. The tap-weights of the adaptive filter (13) are controlled according to the multiplied signal.

REFERENCES:
patent: 4038536 (1977-07-01), Feintuch
patent: 4127874 (1978-11-01), Iwasawa et al.
patent: 4589137 (1986-05-01), Miller
patent: 4658426 (1987-04-01), Chabries et al.
patent: 4878188 (1989-10-01), Ziegler, Jr.

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